Then Prime Minister of India, Indira Gandhi, is welcomed by her grand-daughter Priyanka, son Rajiv Gandhi and his wife Sonia on her return from a state visit to Russia at New Delhi airport on 26 September, 1982 - Photogallery

Then Prime Minister of India, Indira Gandhi, is welcomed by her grand-daughter Priyanka, son Rajiv Gandhi and his wife Sonia on her return from a state visit to Russia at New Delhi airport on 26 September, 1982. (BCCL)

Then Prime Minister of India, Indira Gandhi, is welcomed by her grand-daughter Priyanka, son Rajiv Gandhi and his wife Sonia on her return from a state visit to Russia at New Delhi airport on 26 September, 1982. (BCCL)

File picture of 1980s in which elder son Rajiv Gandhi (2nd L), wife Sonia Gandhi (C), their son, Rahul receive Indira Gandhi, after she returned from an official foreign tour, at Palam airport (Delhi), in New Delhi - Photogallery

File picture of 1980s in which elder son Rajiv Gandhi (2nd L), wife Sonia Gandhi (C), their son, Rahul receive Indira Gandhi, after she returned from an official foreign tour, at Palam airport (Delhi), in New Delhi. (BCCL)

File picture of 1980s in which elder son Rajiv Gandhi (2nd L), wife Sonia Gandhi (C), their son, Rahul receive Indira Gandhi, after she returned from an official foreign tour, at Palam airport (Delhi), in New Delhi. (BCCL)

Indira Gandhi (L) hugs grandson Varun Gandhi as son Rajiv Gandhi (R) and daughter-in-law Sonia Gandhi (black sari) see her off at Delhi airport as she leaves for a foreign tour during 1982 - Photogallery

Indira Gandhi (L) hugs grandson Varun Gandhi as son Rajiv Gandhi (R) and daughter-in-law Sonia Gandhi (black sari) see her off at Delhi airport as she leaves for a foreign tour during 1982. (BCCL)

Indira Gandhi (L) hugs grandson Varun Gandhi as son Rajiv Gandhi (R) and daughter-in-law Sonia Gandhi (black sari) see her off at Delhi airport as she leaves for a foreign tour during 1982. (BCCL)

ALL IN THE FAMILY: Indira Gandhi (L) with sons Rajiv Gandhi (R) and Sanjay Gandhi, daughters-in-law Sonia Gandhi (sitting) and Maneka Gandhi, and grandchildren Rahul and Priyanka, in New Delhi on December 5, 1974 - Photogallery

ALL IN THE FAMILY: Indira Gandhi (L) with sons Rajiv Gandhi (R) and Sanjay Gandhi, daughters-in-law Sonia Gandhi (sitting) and Maneka Gandhi, and grandchildren Rahul and Priyanka, in New Delhi on December 5, 1974. (BCCL)

ALL IN THE FAMILY: Indira Gandhi (L) with sons Rajiv Gandhi (R) and Sanjay Gandhi, daughters-in-law Sonia Gandhi (sitting) and Maneka Gandhi, and grandchildren Rahul and Priyanka, in New Delhi on December 5, 1974. (BCCL)

A file picture of late 1980s Rajiv Gandhi (L to R) Ramaswamy Venkataraman, then Vice - President of India, Sonia Gandhi, wife of Prime Minister Rajiv Gandhi, Giani Zail Singh, then President of India and then Prime Minister of India, Rajiv Gandhi, seen during a function, at Rashtrapati Bhavan, in New Delhi - Photogallery

A file picture of late 1980s Rajiv Gandhi (L to R) Ramaswamy Venkataraman, then Vice - President of India, Sonia Gandhi, wife of Prime Minister Rajiv Gandhi, Giani Zail Singh, then President of India and then Prime Minister of India, Rajiv Gandhi, seen during a function, at Rashtrapati Bhavan, in New Delhi. (BCCL)

A file picture of late 1980s Rajiv Gandhi (L to R) Ramaswamy Venkataraman, then Vice - President of India, Sonia Gandhi, wife of Prime Minister Rajiv Gandhi, Giani Zail Singh, then President of India and then Prime Minister of India, Rajiv Gandhi, seen during a function, at Rashtrapati Bhavan, in New Delhi. (BCCL)